wanglei 899226adac [LoongArch] Add custom parser for atomic instructions' memory operand ...

In order to be compatible with the form of the atomic instruction in
GAS that accepts the fourth operand as 0 (i.e. `am* $rd, $rk, $rj, 0`),
we need to treat `$rj, 0` as one operand, but only print `$rj`.

For this, the number of result operands of inline assembly memory
operand `ZB` constraint is modified to 2 (reg + 0).

Restrictions on register usage in `am*` instructions have also been
adjusted. When `$rd` is equal to `$r0`, the instruction must be
considered legal, because of some special usage like `PseudoUNIMP`.

Reviewed By: SixWeining, xen0n

Differential Revision: https://reviews.llvm.org/D139303

2022-12-13 11:46:53 +08:00

2.4 KiB

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